Commit | Line | Data |
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284e0531 | 1 | /* seh pdata/xdata coff object file format |
250d07de | 2 | Copyright (C) 2009-2021 Free Software Foundation, Inc. |
284e0531 KT |
3 | |
4 | This file is part of GAS. | |
5 | ||
6 | GAS is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GAS is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GAS; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA | |
19 | 02110-1301, USA. */ | |
20 | ||
987499b2 KT |
21 | #include "obj-coff-seh.h" |
22 | ||
987499b2 | 23 | |
2d7f4929 KT |
24 | /* Private segment collection list. */ |
25 | struct seh_seg_list { | |
26 | segT seg; | |
27 | int subseg; | |
28 | char *seg_name; | |
29 | }; | |
30 | ||
987499b2 | 31 | /* Local data. */ |
987499b2 KT |
32 | static seh_context *seh_ctx_cur = NULL; |
33 | ||
629310ab | 34 | static htab_t seh_hash; |
2d7f4929 KT |
35 | |
36 | static struct seh_seg_list *x_segcur = NULL; | |
37 | static struct seh_seg_list *p_segcur = NULL; | |
681418c2 RH |
38 | |
39 | static void write_function_xdata (seh_context *); | |
40 | static void write_function_pdata (seh_context *); | |
604ab327 | 41 | |
681418c2 | 42 | \f |
2d7f4929 KT |
43 | /* Build based on segment the derived .pdata/.xdata |
44 | segment name containing origin segment's postfix name part. */ | |
45 | static char * | |
46 | get_pxdata_name (segT seg, const char *base_name) | |
987499b2 | 47 | { |
2d7f4929 KT |
48 | const char *name,*dollar, *dot; |
49 | char *sname; | |
50 | ||
fd361982 | 51 | name = bfd_section_name (seg); |
2d7f4929 KT |
52 | |
53 | dollar = strchr (name, '$'); | |
54 | dot = strchr (name + 1, '.'); | |
55 | ||
56 | if (!dollar && !dot) | |
57 | name = ""; | |
58 | else if (!dollar) | |
59 | name = dot; | |
60 | else if (!dot) | |
61 | name = dollar; | |
62 | else if (dot < dollar) | |
63 | name = dot; | |
64 | else | |
65 | name = dollar; | |
66 | ||
67 | sname = concat (base_name, name, NULL); | |
68 | ||
69 | return sname; | |
70 | } | |
71 | ||
72 | /* Allocate a seh_seg_list structure. */ | |
73 | static struct seh_seg_list * | |
74 | alloc_pxdata_item (segT seg, int subseg, char *name) | |
75 | { | |
76 | struct seh_seg_list *r; | |
77 | ||
78 | r = (struct seh_seg_list *) | |
79 | xmalloc (sizeof (struct seh_seg_list) + strlen (name)); | |
80 | r->seg = seg; | |
81 | r->subseg = subseg; | |
82 | r->seg_name = name; | |
83 | return r; | |
84 | } | |
85 | ||
86 | /* Generate pdata/xdata segment with same linkonce properties | |
87 | of based segment. */ | |
88 | static segT | |
89 | make_pxdata_seg (segT cseg, char *name) | |
90 | { | |
91 | segT save_seg = now_seg; | |
92 | int save_subseg = now_subseg; | |
93 | segT r; | |
94 | flagword flags; | |
95 | ||
96 | r = subseg_new (name, 0); | |
97 | /* Check if code segment is marked as linked once. */ | |
fd361982 AM |
98 | flags = (bfd_section_flags (cseg) |
99 | & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD | |
100 | | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE | |
101 | | SEC_LINK_DUPLICATES_SAME_CONTENTS)); | |
2d7f4929 KT |
102 | |
103 | /* Add standard section flags. */ | |
104 | flags |= SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA; | |
105 | ||
106 | /* Apply possibly linked once flags to new generated segment, too. */ | |
fd361982 | 107 | if (!bfd_set_section_flags (r, flags)) |
2d7f4929 KT |
108 | as_bad (_("bfd_set_section_flags: %s"), |
109 | bfd_errmsg (bfd_get_error ())); | |
110 | ||
111 | /* Restore to previous segment. */ | |
112 | subseg_set (save_seg, save_subseg); | |
113 | return r; | |
987499b2 KT |
114 | } |
115 | ||
987499b2 | 116 | static void |
2d7f4929 KT |
117 | seh_hash_insert (const char *name, struct seh_seg_list *item) |
118 | { | |
fe0e921f | 119 | str_hash_insert (seh_hash, name, item, 1); |
2d7f4929 KT |
120 | } |
121 | ||
122 | static struct seh_seg_list * | |
123 | seh_hash_find (char *name) | |
987499b2 | 124 | { |
629310ab | 125 | return (struct seh_seg_list *) str_hash_find (seh_hash, name); |
2d7f4929 KT |
126 | } |
127 | ||
128 | static struct seh_seg_list * | |
129 | seh_hash_find_or_make (segT cseg, const char *base_name) | |
130 | { | |
131 | struct seh_seg_list *item; | |
132 | char *name; | |
133 | ||
134 | /* Initialize seh_hash once. */ | |
135 | if (!seh_hash) | |
629310ab | 136 | seh_hash = str_htab_create (); |
2d7f4929 KT |
137 | |
138 | name = get_pxdata_name (cseg, base_name); | |
139 | ||
140 | item = seh_hash_find (name); | |
141 | if (!item) | |
681418c2 | 142 | { |
2d7f4929 KT |
143 | item = alloc_pxdata_item (make_pxdata_seg (cseg, name), 0, name); |
144 | ||
145 | seh_hash_insert (item->seg_name, item); | |
681418c2 RH |
146 | } |
147 | else | |
2d7f4929 KT |
148 | free (name); |
149 | ||
150 | return item; | |
151 | } | |
152 | ||
bea2c1d7 KT |
153 | /* Check if current segment has same name. */ |
154 | static int | |
155 | seh_validate_seg (const char *directive) | |
156 | { | |
157 | const char *cseg_name, *nseg_name; | |
158 | if (seh_ctx_cur->code_seg == now_seg) | |
159 | return 1; | |
fd361982 AM |
160 | cseg_name = bfd_section_name (seh_ctx_cur->code_seg); |
161 | nseg_name = bfd_section_name (now_seg); | |
bea2c1d7 KT |
162 | as_bad (_("%s used in segment '%s' instead of expected '%s'"), |
163 | directive, nseg_name, cseg_name); | |
164 | ignore_rest_of_line (); | |
165 | return 0; | |
166 | } | |
167 | ||
3c6256d2 NC |
168 | /* Switch back to the code section, whatever that may be. */ |
169 | static void | |
170 | obj_coff_seh_code (int ignored ATTRIBUTE_UNUSED) | |
171 | { | |
172 | subseg_set (seh_ctx_cur->code_seg, 0); | |
173 | } | |
174 | ||
2d7f4929 KT |
175 | static void |
176 | switch_xdata (int subseg, segT code_seg) | |
177 | { | |
178 | x_segcur = seh_hash_find_or_make (code_seg, ".xdata"); | |
179 | ||
180 | subseg_set (x_segcur->seg, subseg); | |
181 | } | |
182 | ||
183 | static void | |
184 | switch_pdata (segT code_seg) | |
185 | { | |
186 | p_segcur = seh_hash_find_or_make (code_seg, ".pdata"); | |
187 | ||
188 | subseg_set (p_segcur->seg, p_segcur->subseg); | |
681418c2 RH |
189 | } |
190 | \f | |
191 | /* Parsing routines. */ | |
987499b2 | 192 | |
681418c2 RH |
193 | /* Return the style of SEH unwind info to generate. */ |
194 | ||
195 | static seh_kind | |
196 | seh_get_target_kind (void) | |
197 | { | |
198 | if (!stdoutput) | |
199 | return seh_kind_unknown; | |
200 | switch (bfd_get_arch (stdoutput)) | |
987499b2 | 201 | { |
681418c2 RH |
202 | case bfd_arch_arm: |
203 | case bfd_arch_powerpc: | |
204 | case bfd_arch_sh: | |
205 | return seh_kind_arm; | |
206 | case bfd_arch_i386: | |
207 | switch (bfd_get_mach (stdoutput)) | |
987499b2 | 208 | { |
681418c2 RH |
209 | case bfd_mach_x86_64: |
210 | case bfd_mach_x86_64_intel_syntax: | |
211 | return seh_kind_x64; | |
212 | default: | |
213 | break; | |
987499b2 | 214 | } |
681418c2 RH |
215 | /* FALL THROUGH. */ |
216 | case bfd_arch_mips: | |
217 | return seh_kind_mips; | |
218 | case bfd_arch_ia64: | |
219 | /* Should return seh_kind_x64. But not implemented yet. */ | |
220 | return seh_kind_unknown; | |
987499b2 KT |
221 | default: |
222 | break; | |
223 | } | |
681418c2 | 224 | return seh_kind_unknown; |
987499b2 KT |
225 | } |
226 | ||
681418c2 RH |
227 | /* Verify that we're in the context of a seh_proc. */ |
228 | ||
229 | static int | |
230 | verify_context (const char *directive) | |
987499b2 | 231 | { |
681418c2 | 232 | if (seh_ctx_cur == NULL) |
987499b2 | 233 | { |
681418c2 RH |
234 | as_bad (_("%s used outside of .seh_proc block"), directive); |
235 | ignore_rest_of_line (); | |
236 | return 0; | |
987499b2 | 237 | } |
681418c2 RH |
238 | return 1; |
239 | } | |
987499b2 | 240 | |
681418c2 | 241 | /* Similar, except we also verify the appropriate target. */ |
987499b2 | 242 | |
681418c2 RH |
243 | static int |
244 | verify_context_and_target (const char *directive, seh_kind target) | |
245 | { | |
246 | if (seh_get_target_kind () != target) | |
987499b2 | 247 | { |
681418c2 RH |
248 | as_warn (_("%s ignored for this target"), directive); |
249 | ignore_rest_of_line (); | |
250 | return 0; | |
251 | } | |
252 | return verify_context (directive); | |
253 | } | |
254 | ||
255 | /* Skip whitespace and a comma. Error if the comma is not seen. */ | |
256 | ||
257 | static int | |
258 | skip_whitespace_and_comma (int required) | |
259 | { | |
260 | SKIP_WHITESPACE (); | |
261 | if (*input_line_pointer == ',') | |
262 | { | |
263 | input_line_pointer++; | |
264 | SKIP_WHITESPACE (); | |
265 | return 1; | |
987499b2 | 266 | } |
681418c2 RH |
267 | else if (required) |
268 | { | |
269 | as_bad (_("missing separator")); | |
270 | ignore_rest_of_line (); | |
271 | } | |
272 | else | |
273 | demand_empty_rest_of_line (); | |
274 | return 0; | |
987499b2 KT |
275 | } |
276 | ||
681418c2 | 277 | /* Mark current context to use 32-bit instruction (arm). */ |
1e17085d | 278 | |
987499b2 | 279 | static void |
681418c2 | 280 | obj_coff_seh_32 (int what) |
987499b2 | 281 | { |
681418c2 RH |
282 | if (!verify_context_and_target ((what ? ".seh_32" : ".seh_no32"), |
283 | seh_kind_arm)) | |
284 | return; | |
604ab327 | 285 | |
681418c2 RH |
286 | seh_ctx_cur->use_instruction_32 = (what ? 1 : 0); |
287 | demand_empty_rest_of_line (); | |
288 | } | |
289 | ||
290 | /* Set for current context the handler and optional data (arm). */ | |
291 | ||
292 | static void | |
293 | obj_coff_seh_eh (int what ATTRIBUTE_UNUSED) | |
294 | { | |
295 | if (!verify_context_and_target (".seh_eh", seh_kind_arm)) | |
987499b2 | 296 | return; |
681418c2 RH |
297 | |
298 | /* Write block to .text if exception handler is set. */ | |
299 | seh_ctx_cur->handler_written = 1; | |
300 | emit_expr (&seh_ctx_cur->handler, 4); | |
301 | emit_expr (&seh_ctx_cur->handler_data, 4); | |
302 | ||
303 | demand_empty_rest_of_line (); | |
987499b2 KT |
304 | } |
305 | ||
681418c2 RH |
306 | /* Set for current context the default handler (x64). */ |
307 | ||
987499b2 | 308 | static void |
681418c2 | 309 | obj_coff_seh_handler (int what ATTRIBUTE_UNUSED) |
987499b2 | 310 | { |
681418c2 RH |
311 | char *symbol_name; |
312 | char name_end; | |
313 | ||
314 | if (!verify_context (".seh_handler")) | |
987499b2 | 315 | return; |
681418c2 RH |
316 | |
317 | if (*input_line_pointer == 0 || *input_line_pointer == '\n') | |
318 | { | |
319 | as_bad (_(".seh_handler requires a handler")); | |
320 | demand_empty_rest_of_line (); | |
321 | return; | |
322 | } | |
323 | ||
324 | SKIP_WHITESPACE (); | |
325 | ||
326 | if (*input_line_pointer == '@') | |
987499b2 | 327 | { |
d02603dc | 328 | name_end = get_symbol_name (&symbol_name); |
681418c2 RH |
329 | |
330 | seh_ctx_cur->handler.X_op = O_constant; | |
331 | seh_ctx_cur->handler.X_add_number = 0; | |
332 | ||
333 | if (strcasecmp (symbol_name, "@0") == 0 | |
334 | || strcasecmp (symbol_name, "@null") == 0) | |
335 | ; | |
336 | else if (strcasecmp (symbol_name, "@1") == 0) | |
337 | seh_ctx_cur->handler.X_add_number = 1; | |
338 | else | |
339 | as_bad (_("unknown constant value '%s' for handler"), symbol_name); | |
340 | ||
d02603dc | 341 | (void) restore_line_pointer (name_end); |
987499b2 | 342 | } |
681418c2 RH |
343 | else |
344 | expression (&seh_ctx_cur->handler); | |
987499b2 | 345 | |
681418c2 RH |
346 | seh_ctx_cur->handler_data.X_op = O_constant; |
347 | seh_ctx_cur->handler_data.X_add_number = 0; | |
348 | seh_ctx_cur->handler_flags = 0; | |
349 | ||
350 | if (!skip_whitespace_and_comma (0)) | |
987499b2 KT |
351 | return; |
352 | ||
681418c2 | 353 | if (seh_get_target_kind () == seh_kind_x64) |
987499b2 | 354 | { |
681418c2 | 355 | do |
987499b2 | 356 | { |
d02603dc | 357 | name_end = get_symbol_name (&symbol_name); |
681418c2 RH |
358 | |
359 | if (strcasecmp (symbol_name, "@unwind") == 0) | |
360 | seh_ctx_cur->handler_flags |= UNW_FLAG_UHANDLER; | |
361 | else if (strcasecmp (symbol_name, "@except") == 0) | |
362 | seh_ctx_cur->handler_flags |= UNW_FLAG_EHANDLER; | |
363 | else | |
364 | as_bad (_(".seh_handler constant '%s' unknown"), symbol_name); | |
365 | ||
d02603dc | 366 | (void) restore_line_pointer (name_end); |
987499b2 | 367 | } |
681418c2 RH |
368 | while (skip_whitespace_and_comma (0)); |
369 | } | |
370 | else | |
371 | { | |
372 | expression (&seh_ctx_cur->handler_data); | |
373 | demand_empty_rest_of_line (); | |
374 | ||
375 | if (seh_ctx_cur->handler_written) | |
376 | as_warn (_(".seh_handler after .seh_eh is ignored")); | |
377 | } | |
378 | } | |
379 | ||
380 | /* Switch to subsection for handler data for exception region (x64). */ | |
381 | ||
382 | static void | |
383 | obj_coff_seh_handlerdata (int what ATTRIBUTE_UNUSED) | |
384 | { | |
385 | if (!verify_context_and_target (".seh_handlerdata", seh_kind_x64)) | |
386 | return; | |
387 | demand_empty_rest_of_line (); | |
388 | ||
2d7f4929 | 389 | switch_xdata (seh_ctx_cur->subsection + 1, seh_ctx_cur->code_seg); |
681418c2 RH |
390 | } |
391 | ||
392 | /* Mark end of current context. */ | |
393 | ||
394 | static void | |
395 | do_seh_endproc (void) | |
396 | { | |
397 | seh_ctx_cur->end_addr = symbol_temp_new_now (); | |
398 | ||
399 | write_function_xdata (seh_ctx_cur); | |
400 | write_function_pdata (seh_ctx_cur); | |
401 | seh_ctx_cur = NULL; | |
402 | } | |
403 | ||
404 | static void | |
405 | obj_coff_seh_endproc (int what ATTRIBUTE_UNUSED) | |
406 | { | |
407 | demand_empty_rest_of_line (); | |
408 | if (seh_ctx_cur == NULL) | |
409 | { | |
410 | as_bad (_(".seh_endproc used without .seh_proc")); | |
411 | return; | |
412 | } | |
bea2c1d7 | 413 | seh_validate_seg (".seh_endproc"); |
681418c2 RH |
414 | do_seh_endproc (); |
415 | } | |
416 | ||
417 | /* Mark begin of new context. */ | |
418 | ||
419 | static void | |
420 | obj_coff_seh_proc (int what ATTRIBUTE_UNUSED) | |
421 | { | |
422 | char *symbol_name; | |
423 | char name_end; | |
424 | ||
425 | if (seh_ctx_cur != NULL) | |
426 | { | |
427 | as_bad (_("previous SEH entry not closed (missing .seh_endproc)")); | |
428 | do_seh_endproc (); | |
429 | } | |
430 | ||
431 | if (*input_line_pointer == 0 || *input_line_pointer == '\n') | |
432 | { | |
433 | as_bad (_(".seh_proc requires function label name")); | |
434 | demand_empty_rest_of_line (); | |
435 | return; | |
436 | } | |
437 | ||
438 | seh_ctx_cur = XCNEW (seh_context); | |
439 | ||
2d7f4929 KT |
440 | seh_ctx_cur->code_seg = now_seg; |
441 | ||
681418c2 RH |
442 | if (seh_get_target_kind () == seh_kind_x64) |
443 | { | |
2d7f4929 KT |
444 | x_segcur = seh_hash_find_or_make (seh_ctx_cur->code_seg, ".xdata"); |
445 | seh_ctx_cur->subsection = x_segcur->subseg; | |
446 | x_segcur->subseg += 2; | |
987499b2 | 447 | } |
681418c2 RH |
448 | |
449 | SKIP_WHITESPACE (); | |
450 | ||
d02603dc | 451 | name_end = get_symbol_name (&symbol_name); |
681418c2 | 452 | seh_ctx_cur->func_name = xstrdup (symbol_name); |
d02603dc | 453 | (void) restore_line_pointer (name_end); |
681418c2 RH |
454 | |
455 | demand_empty_rest_of_line (); | |
456 | ||
457 | seh_ctx_cur->start_addr = symbol_temp_new_now (); | |
987499b2 KT |
458 | } |
459 | ||
681418c2 RH |
460 | /* Mark end of prologue for current context. */ |
461 | ||
462 | static void | |
463 | obj_coff_seh_endprologue (int what ATTRIBUTE_UNUSED) | |
464 | { | |
bea2c1d7 KT |
465 | if (!verify_context (".seh_endprologue") |
466 | || !seh_validate_seg (".seh_endprologue")) | |
681418c2 RH |
467 | return; |
468 | demand_empty_rest_of_line (); | |
469 | ||
470 | if (seh_ctx_cur->endprologue_addr != NULL) | |
471 | as_warn (_("duplicate .seh_endprologue in .seh_proc block")); | |
472 | else | |
473 | seh_ctx_cur->endprologue_addr = symbol_temp_new_now (); | |
474 | } | |
475 | ||
476 | /* End-of-file hook. */ | |
477 | ||
987499b2 KT |
478 | void |
479 | obj_coff_seh_do_final (void) | |
480 | { | |
681418c2 | 481 | if (seh_ctx_cur != NULL) |
804a4093 | 482 | as_bad (_("open SEH entry at end of file (missing .seh_endproc)")); |
987499b2 KT |
483 | } |
484 | ||
681418c2 RH |
485 | /* Enter a prologue element into current context (x64). */ |
486 | ||
987499b2 | 487 | static void |
681418c2 | 488 | seh_x64_make_prologue_element (int code, int info, offsetT off) |
987499b2 KT |
489 | { |
490 | seh_prologue_element *n; | |
604ab327 | 491 | |
987499b2 KT |
492 | if (seh_ctx_cur == NULL) |
493 | return; | |
494 | if (seh_ctx_cur->elems_count == seh_ctx_cur->elems_max) | |
495 | { | |
987499b2 | 496 | seh_ctx_cur->elems_max += 8; |
681418c2 RH |
497 | seh_ctx_cur->elems = XRESIZEVEC (seh_prologue_element, |
498 | seh_ctx_cur->elems, | |
499 | seh_ctx_cur->elems_max); | |
987499b2 | 500 | } |
681418c2 RH |
501 | |
502 | n = &seh_ctx_cur->elems[seh_ctx_cur->elems_count++]; | |
503 | n->code = code; | |
504 | n->info = info; | |
505 | n->off = off; | |
506 | n->pc_addr = symbol_temp_new_now (); | |
987499b2 KT |
507 | } |
508 | ||
681418c2 RH |
509 | /* Helper to read a register name from input stream (x64). */ |
510 | ||
987499b2 | 511 | static int |
681418c2 | 512 | seh_x64_read_reg (const char *directive, int kind) |
987499b2 | 513 | { |
681418c2 | 514 | static const char * const int_regs[16] = |
604ab327 NC |
515 | { "rax", "rcx", "rdx", "rbx", "rsp", "rbp","rsi","rdi", |
516 | "r8","r9","r10","r11","r12","r13","r14","r15" }; | |
681418c2 | 517 | static const char * const xmm_regs[16] = |
604ab327 NC |
518 | { "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", |
519 | "xmm8", "xmm9", "xmm10","xmm11","xmm12","xmm13","xmm14","xmm15" }; | |
681418c2 RH |
520 | |
521 | const char * const *regs = NULL; | |
987499b2 KT |
522 | char name_end; |
523 | char *symbol_name = NULL; | |
524 | int i; | |
525 | ||
987499b2 | 526 | switch (kind) |
604ab327 NC |
527 | { |
528 | case 0: | |
604ab327 | 529 | case 1: |
681418c2 | 530 | regs = int_regs; |
604ab327 NC |
531 | break; |
532 | case 2: | |
681418c2 | 533 | regs = xmm_regs; |
604ab327 NC |
534 | break; |
535 | default: | |
536 | abort (); | |
537 | } | |
538 | ||
681418c2 | 539 | SKIP_WHITESPACE (); |
987499b2 KT |
540 | if (*input_line_pointer == '%') |
541 | ++input_line_pointer; | |
d02603dc | 542 | name_end = get_symbol_name (& symbol_name); |
604ab327 | 543 | |
987499b2 | 544 | for (i = 0; i < 16; i++) |
681418c2 | 545 | if (! strcasecmp (regs[i], symbol_name)) |
987499b2 | 546 | break; |
604ab327 | 547 | |
d02603dc | 548 | (void) restore_line_pointer (name_end); |
987499b2 | 549 | |
681418c2 RH |
550 | /* Error if register not found, or EAX used as a frame pointer. */ |
551 | if (i == 16 || (kind == 0 && i == 0)) | |
604ab327 | 552 | { |
681418c2 RH |
553 | as_bad (_("invalid register for %s"), directive); |
554 | return -1; | |
604ab327 | 555 | } |
1e17085d | 556 | |
681418c2 | 557 | return i; |
987499b2 KT |
558 | } |
559 | ||
681418c2 RH |
560 | /* Add a register push-unwind token to the current context. */ |
561 | ||
987499b2 | 562 | static void |
681418c2 | 563 | obj_coff_seh_pushreg (int what ATTRIBUTE_UNUSED) |
987499b2 | 564 | { |
681418c2 RH |
565 | int reg; |
566 | ||
bea2c1d7 KT |
567 | if (!verify_context_and_target (".seh_pushreg", seh_kind_x64) |
568 | || !seh_validate_seg (".seh_pushreg")) | |
681418c2 RH |
569 | return; |
570 | ||
571 | reg = seh_x64_read_reg (".seh_pushreg", 1); | |
987499b2 | 572 | demand_empty_rest_of_line (); |
681418c2 RH |
573 | |
574 | if (reg < 0) | |
575 | return; | |
576 | ||
577 | seh_x64_make_prologue_element (UWOP_PUSH_NONVOL, reg, 0); | |
987499b2 KT |
578 | } |
579 | ||
681418c2 RH |
580 | /* Add a register frame-unwind token to the current context. */ |
581 | ||
987499b2 | 582 | static void |
681418c2 | 583 | obj_coff_seh_pushframe (int what ATTRIBUTE_UNUSED) |
987499b2 | 584 | { |
bea2c1d7 KT |
585 | if (!verify_context_and_target (".seh_pushframe", seh_kind_x64) |
586 | || !seh_validate_seg (".seh_pushframe")) | |
681418c2 | 587 | return; |
987499b2 | 588 | demand_empty_rest_of_line (); |
987499b2 | 589 | |
681418c2 | 590 | seh_x64_make_prologue_element (UWOP_PUSH_MACHFRAME, 0, 0); |
987499b2 KT |
591 | } |
592 | ||
681418c2 RH |
593 | /* Add a register save-unwind token to current context. */ |
594 | ||
987499b2 | 595 | static void |
681418c2 | 596 | obj_coff_seh_save (int what) |
987499b2 | 597 | { |
681418c2 RH |
598 | const char *directive = (what == 1 ? ".seh_savereg" : ".seh_savexmm"); |
599 | int code, reg, scale; | |
600 | offsetT off; | |
987499b2 | 601 | |
bea2c1d7 KT |
602 | if (!verify_context_and_target (directive, seh_kind_x64) |
603 | || !seh_validate_seg (directive)) | |
681418c2 | 604 | return; |
987499b2 | 605 | |
681418c2 | 606 | reg = seh_x64_read_reg (directive, what); |
987499b2 | 607 | |
681418c2 RH |
608 | if (!skip_whitespace_and_comma (1)) |
609 | return; | |
987499b2 | 610 | |
681418c2 | 611 | off = get_absolute_expression (); |
987499b2 | 612 | demand_empty_rest_of_line (); |
987499b2 | 613 | |
681418c2 RH |
614 | if (reg < 0) |
615 | return; | |
616 | if (off < 0) | |
987499b2 | 617 | { |
681418c2 | 618 | as_bad (_("%s offset is negative"), directive); |
987499b2 KT |
619 | return; |
620 | } | |
621 | ||
681418c2 | 622 | scale = (what == 1 ? 8 : 16); |
987499b2 | 623 | |
6e0973c0 | 624 | if ((off & (scale - 1)) == 0 && off <= (offsetT) (0xffff * scale)) |
987499b2 | 625 | { |
681418c2 RH |
626 | code = (what == 1 ? UWOP_SAVE_NONVOL : UWOP_SAVE_XMM128); |
627 | off /= scale; | |
987499b2 | 628 | } |
6e0973c0 | 629 | else if (off < (offsetT) 0xffffffff) |
681418c2 RH |
630 | code = (what == 1 ? UWOP_SAVE_NONVOL_FAR : UWOP_SAVE_XMM128_FAR); |
631 | else | |
604ab327 | 632 | { |
681418c2 | 633 | as_bad (_("%s offset out of range"), directive); |
604ab327 NC |
634 | return; |
635 | } | |
681418c2 RH |
636 | |
637 | seh_x64_make_prologue_element (code, reg, off); | |
987499b2 KT |
638 | } |
639 | ||
681418c2 RH |
640 | /* Add a stack-allocation token to current context. */ |
641 | ||
987499b2 | 642 | static void |
681418c2 | 643 | obj_coff_seh_stackalloc (int what ATTRIBUTE_UNUSED) |
987499b2 | 644 | { |
681418c2 RH |
645 | offsetT off; |
646 | int code, info; | |
604ab327 | 647 | |
bea2c1d7 KT |
648 | if (!verify_context_and_target (".seh_stackalloc", seh_kind_x64) |
649 | || !seh_validate_seg (".seh_stackalloc")) | |
681418c2 | 650 | return; |
1e17085d | 651 | |
681418c2 | 652 | off = get_absolute_expression (); |
987499b2 | 653 | demand_empty_rest_of_line (); |
987499b2 | 654 | |
681418c2 RH |
655 | if (off == 0) |
656 | return; | |
657 | if (off < 0) | |
604ab327 | 658 | { |
681418c2 | 659 | as_bad (_(".seh_stackalloc offset is negative")); |
604ab327 NC |
660 | return; |
661 | } | |
987499b2 | 662 | |
681418c2 RH |
663 | if ((off & 7) == 0 && off <= 128) |
664 | code = UWOP_ALLOC_SMALL, info = (off - 8) >> 3, off = 0; | |
6e0973c0 | 665 | else if ((off & 7) == 0 && off <= (offsetT) (0xffff * 8)) |
681418c2 | 666 | code = UWOP_ALLOC_LARGE, info = 0, off >>= 3; |
6e0973c0 | 667 | else if (off <= (offsetT) 0xffffffff) |
681418c2 | 668 | code = UWOP_ALLOC_LARGE, info = 1; |
987499b2 | 669 | else |
604ab327 | 670 | { |
681418c2 | 671 | as_bad (_(".seh_stackalloc offset out of range")); |
604ab327 NC |
672 | return; |
673 | } | |
681418c2 RH |
674 | |
675 | seh_x64_make_prologue_element (code, info, off); | |
987499b2 KT |
676 | } |
677 | ||
681418c2 RH |
678 | /* Add a frame-pointer token to current context. */ |
679 | ||
987499b2 KT |
680 | static void |
681 | obj_coff_seh_setframe (int what ATTRIBUTE_UNUSED) | |
682 | { | |
681418c2 | 683 | offsetT off; |
987499b2 | 684 | int reg; |
987499b2 | 685 | |
bea2c1d7 KT |
686 | if (!verify_context_and_target (".seh_setframe", seh_kind_x64) |
687 | || !seh_validate_seg (".seh_setframe")) | |
681418c2 RH |
688 | return; |
689 | ||
690 | reg = seh_x64_read_reg (".seh_setframe", 0); | |
691 | ||
692 | if (!skip_whitespace_and_comma (1)) | |
693 | return; | |
694 | ||
695 | off = get_absolute_expression (); | |
696 | demand_empty_rest_of_line (); | |
697 | ||
698 | if (reg < 0) | |
699 | return; | |
700 | if (off < 0) | |
701 | as_bad (_(".seh_setframe offset is negative")); | |
702 | else if (off > 240) | |
703 | as_bad (_(".seh_setframe offset out of range")); | |
704 | else if (off & 15) | |
705 | as_bad (_(".seh_setframe offset not a multiple of 16")); | |
706 | else if (seh_ctx_cur->framereg != 0) | |
707 | as_bad (_("duplicate .seh_setframe in current .seh_proc")); | |
708 | else | |
604ab327 NC |
709 | { |
710 | seh_ctx_cur->framereg = reg; | |
711 | seh_ctx_cur->frameoff = off; | |
681418c2 | 712 | seh_x64_make_prologue_element (UWOP_SET_FPREG, 0, 0); |
604ab327 | 713 | } |
987499b2 | 714 | } |
681418c2 RH |
715 | \f |
716 | /* Data writing routines. */ | |
987499b2 | 717 | |
681418c2 | 718 | /* Output raw integers in 1, 2, or 4 bytes. */ |
987499b2 | 719 | |
681418c2 RH |
720 | static inline void |
721 | out_one (int byte) | |
987499b2 | 722 | { |
681418c2 | 723 | FRAG_APPEND_1_CHAR (byte); |
987499b2 KT |
724 | } |
725 | ||
681418c2 RH |
726 | static inline void |
727 | out_two (int data) | |
987499b2 | 728 | { |
681418c2 | 729 | md_number_to_chars (frag_more (2), data, 2); |
987499b2 KT |
730 | } |
731 | ||
681418c2 RH |
732 | static inline void |
733 | out_four (int data) | |
987499b2 | 734 | { |
681418c2 | 735 | md_number_to_chars (frag_more (4), data, 4); |
987499b2 KT |
736 | } |
737 | ||
681418c2 RH |
738 | /* Write out prologue data for x64. */ |
739 | ||
740 | static void | |
741 | seh_x64_write_prologue_data (const seh_context *c) | |
987499b2 | 742 | { |
681418c2 | 743 | int i; |
604ab327 | 744 | |
681418c2 RH |
745 | /* We have to store in reverse order. */ |
746 | for (i = c->elems_count - 1; i >= 0; --i) | |
747 | { | |
748 | const seh_prologue_element *e = c->elems + i; | |
749 | expressionS exp; | |
987499b2 | 750 | |
681418c2 RH |
751 | /* First comes byte offset in code. */ |
752 | exp.X_op = O_subtract; | |
753 | exp.X_add_symbol = e->pc_addr; | |
754 | exp.X_op_symbol = c->start_addr; | |
755 | exp.X_add_number = 0; | |
756 | emit_expr (&exp, 1); | |
987499b2 | 757 | |
681418c2 RH |
758 | /* Second comes code+info packed into a byte. */ |
759 | out_one ((e->info << 4) | e->code); | |
987499b2 | 760 | |
681418c2 | 761 | switch (e->code) |
987499b2 | 762 | { |
681418c2 RH |
763 | case UWOP_PUSH_NONVOL: |
764 | case UWOP_ALLOC_SMALL: | |
765 | case UWOP_SET_FPREG: | |
766 | case UWOP_PUSH_MACHFRAME: | |
767 | /* These have no extra data. */ | |
987499b2 | 768 | break; |
681418c2 RH |
769 | |
770 | case UWOP_ALLOC_LARGE: | |
771 | if (e->info) | |
772 | { | |
773 | case UWOP_SAVE_NONVOL_FAR: | |
774 | case UWOP_SAVE_XMM128_FAR: | |
775 | /* An unscaled 4 byte offset. */ | |
776 | out_four (e->off); | |
777 | break; | |
778 | } | |
779 | /* FALLTHRU */ | |
780 | ||
781 | case UWOP_SAVE_NONVOL: | |
782 | case UWOP_SAVE_XMM128: | |
783 | /* A scaled 2 byte offset. */ | |
784 | out_two (e->off); | |
785 | break; | |
786 | ||
787 | default: | |
788 | abort (); | |
987499b2 | 789 | } |
987499b2 | 790 | } |
987499b2 KT |
791 | } |
792 | ||
681418c2 RH |
793 | static int |
794 | seh_x64_size_prologue_data (const seh_context *c) | |
795 | { | |
796 | int i, ret = 0; | |
797 | ||
798 | for (i = c->elems_count - 1; i >= 0; --i) | |
799 | switch (c->elems[i].code) | |
800 | { | |
801 | case UWOP_PUSH_NONVOL: | |
802 | case UWOP_ALLOC_SMALL: | |
803 | case UWOP_SET_FPREG: | |
804 | case UWOP_PUSH_MACHFRAME: | |
805 | ret += 1; | |
806 | break; | |
987499b2 | 807 | |
681418c2 RH |
808 | case UWOP_SAVE_NONVOL: |
809 | case UWOP_SAVE_XMM128: | |
810 | ret += 2; | |
811 | break; | |
987499b2 | 812 | |
681418c2 RH |
813 | case UWOP_SAVE_NONVOL_FAR: |
814 | case UWOP_SAVE_XMM128_FAR: | |
815 | ret += 3; | |
816 | break; | |
987499b2 | 817 | |
681418c2 RH |
818 | case UWOP_ALLOC_LARGE: |
819 | ret += (c->elems[i].info ? 3 : 2); | |
820 | break; | |
987499b2 | 821 | |
681418c2 RH |
822 | default: |
823 | abort (); | |
824 | } | |
987499b2 | 825 | |
681418c2 | 826 | return ret; |
987499b2 KT |
827 | } |
828 | ||
681418c2 RH |
829 | /* Write out the xdata information for one function (x64). */ |
830 | ||
831 | static void | |
832 | seh_x64_write_function_xdata (seh_context *c) | |
987499b2 | 833 | { |
681418c2 RH |
834 | int flags, count_unwind_codes; |
835 | expressionS exp; | |
987499b2 | 836 | |
681418c2 RH |
837 | /* Set 4-byte alignment. */ |
838 | frag_align (2, 0, 0); | |
987499b2 | 839 | |
681418c2 RH |
840 | c->xdata_addr = symbol_temp_new_now (); |
841 | flags = c->handler_flags; | |
842 | count_unwind_codes = seh_x64_size_prologue_data (c); | |
987499b2 | 843 | |
681418c2 RH |
844 | /* ubyte:3 version, ubyte:5 flags. */ |
845 | out_one ((flags << 3) | 1); | |
987499b2 | 846 | |
681418c2 RH |
847 | /* Size of prologue. */ |
848 | if (c->endprologue_addr) | |
849 | { | |
850 | exp.X_op = O_subtract; | |
851 | exp.X_add_symbol = c->endprologue_addr; | |
852 | exp.X_op_symbol = c->start_addr; | |
853 | exp.X_add_number = 0; | |
854 | emit_expr (&exp, 1); | |
855 | } | |
856 | else | |
857 | out_one (0); | |
987499b2 | 858 | |
681418c2 RH |
859 | /* Number of slots (i.e. shorts) in the unwind codes array. */ |
860 | if (count_unwind_codes > 255) | |
861 | as_fatal (_("too much unwind data in this .seh_proc")); | |
862 | out_one (count_unwind_codes); | |
987499b2 | 863 | |
681418c2 RH |
864 | /* ubyte:4 frame-reg, ubyte:4 frame-reg-offset. */ |
865 | /* Note that frameoff is already a multiple of 16, and therefore | |
866 | the offset is already both scaled and shifted into place. */ | |
867 | out_one (c->frameoff | c->framereg); | |
604ab327 | 868 | |
681418c2 | 869 | seh_x64_write_prologue_data (c); |
987499b2 | 870 | |
681418c2 RH |
871 | /* We need to align prologue data. */ |
872 | if (count_unwind_codes & 1) | |
873 | out_two (0); | |
874 | ||
875 | if (flags & (UNW_FLAG_EHANDLER | UNW_FLAG_UHANDLER)) | |
604ab327 | 876 | { |
681418c2 RH |
877 | /* Force the use of segment-relative relocations instead of absolute |
878 | valued expressions. Don't adjust for constants (e.g. NULL). */ | |
879 | if (c->handler.X_op == O_symbol) | |
880 | c->handler.X_op = O_symbol_rva; | |
881 | emit_expr (&c->handler, 4); | |
604ab327 | 882 | } |
681418c2 RH |
883 | |
884 | /* Handler data will be tacked in here by subsections. */ | |
987499b2 KT |
885 | } |
886 | ||
681418c2 | 887 | /* Write out xdata for one function. */ |
987499b2 KT |
888 | |
889 | static void | |
681418c2 | 890 | write_function_xdata (seh_context *c) |
987499b2 | 891 | { |
681418c2 RH |
892 | segT save_seg = now_seg; |
893 | int save_subseg = now_subseg; | |
894 | ||
895 | /* MIPS, SH, ARM don't have xdata. */ | |
896 | if (seh_get_target_kind () != seh_kind_x64) | |
987499b2 | 897 | return; |
987499b2 | 898 | |
2d7f4929 | 899 | switch_xdata (c->subsection, c->code_seg); |
987499b2 | 900 | |
681418c2 | 901 | seh_x64_write_function_xdata (c); |
1e17085d | 902 | |
681418c2 | 903 | subseg_set (save_seg, save_subseg); |
1e17085d KT |
904 | } |
905 | ||
681418c2 | 906 | /* Write pdata section data for one function (arm). */ |
987499b2 | 907 | |
681418c2 RH |
908 | static void |
909 | seh_arm_write_function_pdata (seh_context *c) | |
987499b2 | 910 | { |
681418c2 RH |
911 | expressionS exp; |
912 | unsigned int prol_len = 0, func_len = 0; | |
913 | unsigned int val; | |
604ab327 | 914 | |
681418c2 RH |
915 | /* Start address of the function. */ |
916 | exp.X_op = O_symbol; | |
917 | exp.X_add_symbol = c->start_addr; | |
918 | exp.X_add_number = 0; | |
919 | emit_expr (&exp, 4); | |
920 | ||
921 | exp.X_op = O_subtract; | |
922 | exp.X_add_symbol = c->end_addr; | |
923 | exp.X_op_symbol = c->start_addr; | |
924 | exp.X_add_number = 0; | |
925 | if (resolve_expression (&exp) && exp.X_op == O_constant) | |
926 | func_len = exp.X_add_number; | |
987499b2 | 927 | else |
681418c2 RH |
928 | as_bad (_(".seh_endproc in a different section from .seh_proc")); |
929 | ||
930 | if (c->endprologue_addr) | |
987499b2 | 931 | { |
681418c2 RH |
932 | exp.X_op = O_subtract; |
933 | exp.X_add_symbol = c->endprologue_addr; | |
934 | exp.X_op_symbol = c->start_addr; | |
935 | exp.X_add_number = 0; | |
936 | ||
937 | if (resolve_expression (&exp) && exp.X_op == O_constant) | |
938 | prol_len = exp.X_add_number; | |
939 | else | |
940 | as_bad (_(".seh_endprologue in a different section from .seh_proc")); | |
987499b2 | 941 | } |
681418c2 RH |
942 | |
943 | /* Both function and prologue are in units of instructions. */ | |
944 | func_len >>= (c->use_instruction_32 ? 2 : 1); | |
945 | prol_len >>= (c->use_instruction_32 ? 2 : 1); | |
946 | ||
947 | /* Assemble the second word of the pdata. */ | |
948 | val = prol_len & 0xff; | |
949 | val |= (func_len & 0x3fffff) << 8; | |
950 | if (c->use_instruction_32) | |
951 | val |= 0x40000000U; | |
952 | if (c->handler_written) | |
953 | val |= 0x80000000U; | |
954 | out_four (val); | |
987499b2 KT |
955 | } |
956 | ||
681418c2 RH |
957 | /* Write out pdata for one function. */ |
958 | ||
987499b2 | 959 | static void |
681418c2 | 960 | write_function_pdata (seh_context *c) |
987499b2 | 961 | { |
681418c2 RH |
962 | expressionS exp; |
963 | segT save_seg = now_seg; | |
964 | int save_subseg = now_subseg; | |
2d7f4929 KT |
965 | memset (&exp, 0, sizeof (expressionS)); |
966 | switch_pdata (c->code_seg); | |
681418c2 RH |
967 | |
968 | switch (seh_get_target_kind ()) | |
987499b2 | 969 | { |
681418c2 RH |
970 | case seh_kind_x64: |
971 | exp.X_op = O_symbol_rva; | |
972 | exp.X_add_number = 0; | |
973 | ||
974 | exp.X_add_symbol = c->start_addr; | |
975 | emit_expr (&exp, 4); | |
2d7f4929 KT |
976 | exp.X_op = O_symbol_rva; |
977 | exp.X_add_number = 0; | |
681418c2 RH |
978 | exp.X_add_symbol = c->end_addr; |
979 | emit_expr (&exp, 4); | |
2d7f4929 KT |
980 | exp.X_op = O_symbol_rva; |
981 | exp.X_add_number = 0; | |
681418c2 RH |
982 | exp.X_add_symbol = c->xdata_addr; |
983 | emit_expr (&exp, 4); | |
984 | break; | |
987499b2 | 985 | |
681418c2 RH |
986 | case seh_kind_mips: |
987 | exp.X_op = O_symbol; | |
988 | exp.X_add_number = 0; | |
987499b2 | 989 | |
681418c2 RH |
990 | exp.X_add_symbol = c->start_addr; |
991 | emit_expr (&exp, 4); | |
992 | exp.X_add_symbol = c->end_addr; | |
993 | emit_expr (&exp, 4); | |
987499b2 | 994 | |
681418c2 RH |
995 | emit_expr (&c->handler, 4); |
996 | emit_expr (&c->handler_data, 4); | |
604ab327 | 997 | |
681418c2 RH |
998 | exp.X_add_symbol = (c->endprologue_addr |
999 | ? c->endprologue_addr | |
1000 | : c->start_addr); | |
1001 | emit_expr (&exp, 4); | |
1002 | break; | |
987499b2 | 1003 | |
681418c2 RH |
1004 | case seh_kind_arm: |
1005 | seh_arm_write_function_pdata (c); | |
1006 | break; | |
604ab327 | 1007 | |
681418c2 RH |
1008 | default: |
1009 | abort (); | |
987499b2 | 1010 | } |
681418c2 RH |
1011 | |
1012 | subseg_set (save_seg, save_subseg); | |
987499b2 | 1013 | } |